main topics,abstracts ＆ key words

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1、WELDING＆JOINlNGMAINTOPICS．ABSTRACTS&KEYWORDSSummarizationaboutmeasurementmethodsofarccurrentdensityandarcpressureChenShujun，TaoDongbo，BaiShaojun，YuYang，BaiLilai(CollegeofMechanicalEngineering＆AppliedElectronicsTechnology，BeijingUniversityofTechnology，Beijing100124，China)．pl一6AbstractArcc

2、urrentdensityandarcpressurearetwoimportantparametersinthearcweldingprocess．Somecommonmethodstomeasurearccurentdensityandarcpressureweresummarizedinthispaper．Themethodstomeasurearccurentdensitycouldbedividedintoindirectmethodsanddirectmethods．Theformerincludedthesplitanodemethod，theanalys

3、isforablatingtrace，opticalmethodandsoon．TheSplitanodemethodwasdiscussedindetail．Thelatterincludedtheprobemethod．Themethodstomeasurearcpressureweremainlyusedinthenon—consumablegasshieldedarcwelding，whichincludedcontinuousmeasurementmethodofsensorsandthestaticmeasurementmethodofBa-ronleter

4、．Keywords：arccurrent，arcpressure，measurementmethodsMartensiteinweldmetalofmodifiedP9lheat．resistantsteelSunXian‘，WangHonghong(1．InstituteofWeldingConsumables，TaiyuanUniversityofTechnology，Taiyuan030024，China；2．WuhanUniversityofScienceandTech—nology，Wuhan430081，China)．p7—11，12AbstractThem

5、orphologyofmartensitestructureanditsfon'nationconditionsintheweldmetalofP91steelwereintroducedfirstly．Theinflu—encingfactorsonmartensitestructurewereanalyzed．Theeffectofmartensitemorphologyonweldmetaltoughnesswasdiscussed，andthenthemechanismtocontrolmartensitemorphologywasproposed．Theexp

6、erimentalresultsshowthattheas—depositedmierostruetureofP91weldmet-alisconsistedoflathmartensiteand8ferrite．Afterpost—weldheattreatment．itistemperedmartensite+8ferite+carbides．Lathoftem-peredmartensiteisbrokenupandtheorientationoflathdisappears，thedislocationdensitybecomesmal1．Itissuggest

7、edthatthechangeofmartensitemorphologyiscontrolledbyweldingheatinputtoalargeextent．Intheinfluencingfactorsofmartensitestructure，alloyingelements，theoptimumcontentofalloyingelements，theproperweldingparameters(suchasalowweldingheatinput，lowerpreheattemperaturesandin—terpasst